The Duende.BFF (Backend for Frontend) security framework packages the necessary components to secure browser-based frontends (e.g. SPAs or Blazor WASM applications) with ASP.NET Core backends.
Duende.BFF is included in IdentityServer Business Edition or higher. The same license and special offers apply.
The source code for the BFF framework can be found here. Builds are distributed through NuGet here, and samples are available here.